the administration has called the libya violence a terrorist attack but yesterday president obama used different terms to describe what happened. >> we're still doing an investigation. there's no doubt that the kind of weapons that were used that -- the ongoing assault, that it wasn't just a mob action. >> now, a white house security adviser is denouncing a coverup and are investigating exactly what happened to make sure diplomats are safe. >>> israel is not happy that iran's president is speaking to the u.n. general assembly on one of israel's most holiest days, yom kippur. some say they will walk out during mahmoud ahmadinejad's speech. alison burns is live from washington, d.c. with how the president is responding to new threats from the united states. >> reporter: tori, mahmoud ahmadinejad seems to be dismissing all of these warnings about iran's nuclear program. this will be his fine at speech to the united nations as he winds down his terms. the iranian president is calling for a new world order to replace what he calls the era of bullying to the u.s. iran has become a central fo